batgrbproduct Analysis for Trigger=334877

Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.42
    Process Start Time (local time): Wed Nov 19 08:35:52 EST 2008
             Host Name: gcn5
   Current Working Dir: /local/data/raid2/prebascript/trigger334877/GCN5_download_cron
======================================================================

  Trigger: 00334877      Segment: 000

  BAT Trigger Time: 248713000   [s; MET]
      Trigger Stop: 248713064   [s; MET]
               UTC: 2008-11-18T14:56:36.734580    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 82.5899853305401   Dec: -43.3021771582674  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    15.02
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    15.02

  Flight Position:   [ source = BAT ]
    RA: 82.5899853305401   Dec: -43.3021771582674  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 82.5718403671956   Dec: -43.3043786084092  [deg; J2000]  
        { 05h 30m 17.2s , -43d 18' 15.8" }
         +/- 1.56772326296886 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.75995896878235 [arcmin] (formal 1-sigma fit error)
    SNR: 16.0015513795652
 
  Angular difference between Flight and Ground position is 0.803217 arcmin
 
  Partial Coding Fraction: 0.6171875    [ including projection effects ]

  Duration
     T90: 66.5119999647141 +/- 27.7741796632779
        Measured from: 24.808000087738
                   to: 91.3200000524521     [s; relative to TRIGTIME]
     T50: 27.567999958992 +/- 4.98286986693735
        Measured from: 36.9040001034737
                   to: 64.4720000624657     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 46.972000002861     
                   to: 47.972000002861     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 19.608000010252     
                   to: 118.583999991417     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.847072   0.857969   0.455450   0.014311
           0.061390   0.061716   0.055067   0.048984 [error]
 Peak      0.024359   0.026352   0.013060   0.008281
           0.006650   0.006737   0.006007   0.005411 [error]

     [ fluence units of on-axis counts / fully illuminated detector ] 

======================================================================
 
=== Fluence/Peak Flux Summary ===
 
              Model    Band1    Band2    Band3    Band4    Band5    Total      
                       15-25    25-50   50-100  100-350   15-150   15-350   keV
Fluence   Power-law 2.97e-07 3.79e-07 3.53e-07 5.78e-07 1.22e-06 1.61e-06   erg/cm2
              Error 3.53e-08 3.14e-08 5.22e-08 1.69e-07 1.19e-07 2.27e-07   erg/cm2
Peak flux Power-law 2.34e-01 2.04e-01 1.22e-01 1.09e-01 6.06e-01 6.68e-01   ph/cm2/s
              Error 1.01e-01 5.68e-02 4.90e-02 8.90e-02 1.68e-01 1.86e-01   ph/cm2/s
 
Fluence   Cutoff-PL 2.82e-07 4.01e-07 3.46e-07 2.47e-07 1.17e-06 1.28e-06   erg/cm2
              Error 3.99e-08 4.17e-08 5.82e-08 2.87e-07 1.35e-07 3.15e-07   erg/cm2
Peak flux Cutoff-PL 2.25e-01 2.09e-01 1.24e-01 8.07e-02 6.00e-01 6.40e-01   ph/cm2/s
              Error 1.13e-01 6.81e-02 5.33e-02 1.05e-01 1.73e-01 2.10e-01   ph/cm2/s
 
Fluence        Band 2.79e-07 4.00e-07 3.45e-07 2.46e-07 1.16e-06 1.28e-06   erg/cm2
              Error 3.95e-08 4.15e-08 5.81e-08 2.86e-07 1.35e-07 3.30e-07   erg/cm2
Peak flux      Band 2.25e-01 2.09e-01 1.24e-01 8.07e-02 6.00e-01 6.39e-01   ph/cm2/s
              Error 1.69e-01 6.81e-02 5.34e-02 1.03e-01 1.74e-01 2.10e-01   ph/cm2/s
 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.101    0.163    -      -           1.33e-03 1.42e-04   55.526 57
CPL   1.569    0.619      34.3   24.9      2.67e-03 3.36e-03   53.533  0
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.745    0.519    -      -           4.49e-03 1.40e-03   50.788 57
CPL   1.246    1.723      72.3    0.0      8.20e-03 6.99e-02   50.783  0
 
Model      : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index   : photon index: E^-{Ph_index} (minus sign is not included in the index)
Ph_90err   : 90% error of the photon index
Epeak      : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm       : normalization at 50 keV in PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2       : Chi-Squared
dof        : degree of freedom
 
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
 
T90 in the 50-300 keV band: 51.840000 sec.
T50 in the 50-300 keV band: 14.912000 sec.
 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   98.976   19.608  118.584
T90    66.512   24.808   91.320
T50    27.568   36.904   64.472
Peak    1.000   46.972   47.972

Image

Pre-slew 15-350 keV image (Event data; bkg subtracted)

#   RAcent  DECcent POSerr  Theta    Phi     Peak Cts     SNR  Name
   82.5718 -43.3044 0.0120   38.6 -170.2       1.8757    16.0  TRIG_00334877       
------------------------------------------
 
Foreground time interval of the image:
 19.608  73.601 (delta_t =  53.993 [sec])
Background time interval of the image:
-68.799 -56.296 (delta_t =  12.503 [sec])
-55.000  11.150 (delta_t =  66.150 [sec])
 12.000  19.608 (delta_t =   7.608 [sec])

Lightcurves

Notes:

1 s binning

From T0-310 s to T0+310 s
From T100_start - 20 s to T100_end + 30 s
Full time interval

64 ms binning

Full time interval
From T100_start to T100_end
From T0-5 sec to T0+5 sec

16 ms binning

From T100_start-5 s to T100_start+5 s

8 ms binning

From T100_start-3 s to T100_start+3 s

2 ms binning

From T100_start-1 s to T100_start+1 s

SN=5 or 10 sec. binning (whichever binning is satisfied first)

SN=5 or 10 sec. binning (T < 200 sec)

Spectra

Notes:

Time averaged spectrum fit using the pre-slew DRM

Power-law model
Time interval is from   19.608 sec. to  118.584 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.10110     ( -0.158605   0.166560 )
Norm@50keV  : 1.330301E-03    ( -1.431013E-04   1.403283E-04) )
------------------------------------------------------------
 Chi-Squared =      55.52605     using    59 PHA bins.
 Reduced chi-squared =     0.9741412     for     57 degrees of freedom
 Null hypothesis probability = 0.531
 
Photon flux (15-150 keV)    in 98.98 sec: 0.209405 ( -0.017381  0.017394 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.22352e-06 ( -1.17945e-07  1.19825e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   19.608 sec. to  118.584 sec.
Photon index: 1.56949     ( -0.706375   0.531455 )
Epeak [keV] : 34.3075      ( -33.1464 16.7109 )
Norm@50keV  : 2.668599E-03    ( -2.668599E-03   4.049866E-03) )
------------------------------------------------------------
 Chi-Squared =      53.53341     using    59 PHA bins.
 but latest trial   2.10094     gives Chi-Squared =   1.99950
 but latest trial   1.16108     gives Chi-Squared =   6.29228
 but latest trial   65.8975     gives Chi-Squared =   3.06023
 Reduced chi-squared =     0.9559537     for     56 degrees of freedom
 Null hypothesis probability = 0.569
 
Photon flux (15-150 keV)    in 98.98 sec: 0.204638 ( -0.018243  0.018258 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.16622e-06 ( -1.32445e-07  1.37058e-07 ) ergs/cm2
 
Band function
Time interval is from   19.608 sec. to  118.584 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.64514   ( -8.35486   0.632632 )
beta        : -8.85147    ( -1.14853   6.83388 )
Epeak [keV] : 32.8359      ( -16.5899 19.7428 )
Norm@50keV   : 2.426478E-03    ( -1.041919E-03   4.319345E-03) )
------------------------------------------------------------
 Chi-Squared =      53.55451     using    59 PHA bins.
 Reduced chi-squared =     0.9737184     for     55 degrees of freedom
 Null hypothesis probability = 0.530
 
Photon flux (15-150 keV)    in 98.98 sec: 0.204653 ( -0.018264  0.018253 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.16456e-06 ( -1.32505e-07  1.36899e-07 ) ergs/cm2
 

Peak spectrum fit using the pre-slew DRM

Power-law model
Time interval is from   46.968 sec. to   47.976 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.74495     ( -0.491862   0.546707 )
Norm@50keV  : 4.488541E-03    ( -1.441368E-03   1.361339E-03) )
------------------------------------------------------------
 Chi-Squared =      50.78765     using    59 PHA bins.
 Reduced chi-squared =     0.8910114     for     57 degrees of freedom
 Null hypothesis probability = 0.706
 
Photon flux (15-150 keV)    in 1.008 sec: 0.605801 ( -0.168183  0.168504 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.1759e-08 ( -1.32318e-08  1.36878e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from   46.968 sec. to   47.976 sec.
Parameters  : value       lower 90%   higher 90%
Photon index: 1.24552     ( -2.46260   0.982709 )
Epeak [keV] : 72.2983      (   )
Norm@50keV  : 8.201069E-03    ( -2.151692E-03   0.137745 )
------------------------------------------------------------
 Chi-Squared =      50.78297     using    59 PHA bins.
 but latest trial   2.22793     gives Chi-Squared =  0.242844
 but latest trial  2.817540E-03 gives Chi-Squared =  0.206791
 Reduced chi-squared =     0.9068388     for     56 degrees of freedom
 Null hypothesis probability = 0.672
 
Photon flux (15-150 keV)    in 1.008 sec: 0.600170 ( -0.174857  0.171412 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.10467e-08 ( -1.39929e-08  1.36146e-08 ) ergs/cm2
 
Band function
Time interval is from   46.968 sec. to   47.976 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : -1.27439   ( -8.72561   3.56442 )
beta        : -2.35126    ( -7.64874   12.2084 )
Epeak [keV] : 74.4017      ( -74.3017 9925.60 )
Norm@50keV   : 7.899481E-03    ( -7.899481E-03   13907.6 )
------------------------------------------------------------
 Chi-Squared =      50.77193     using    59 PHA bins.
 Reduced chi-squared =     0.9231261     for     55 degrees of freedom
 Null hypothesis probability = 0.637
 
Photon flux (15-150 keV)    in 1.008 sec: 0.600189 ( -0.175129  0.172349 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.10368e-08 ( -1.3992e-08  1.42472e-08 ) ergs/cm2
 
Plot creation:
Wed Nov 19 09:25:01 EST 2008